稻田亚硝酸盐型甲烷厌氧氧化对大气CO2浓度缓增的响应
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1.南京信息工程大学生态系;2.南京信息工程大学应用气象系

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基金项目:

国家自然科学基金项目(41977037);江苏省自然科学基金项目(BK20190092);江苏省大学生创新创业训练计划项目(202110300110Y)


Response of nitrite-dependent anaerobic methane oxidation in paddy fields to slow increase of atmospheric CO2 concentration
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Affiliation:

1.Department of Ecology, Nanjing University of Information Science and Technology;2.Department of Applied Meteorology, Nanjing University of Information Science and Technology

Fund Project:

National Natural Science Foundation of China(41977037);Natural Science Foundation of Jiangsu Province(BK20190092);Innovation and Entrepreneurship Training program for College students in Jiangsu Province(202110300110Y)

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    摘要:

    亚硝酸盐型甲烷厌氧氧化(nitrite-dependent anaerobic methane oxidation, n-damo)是控制稻田甲烷排放的一种新途径,但有关其在稻田甲烷氧化中的贡献及其对大气CO2升高的响应尚不清楚。本文依托开顶式气室组成的CO2浓度自动调控平台,在环境 CO2浓度(CK)基础上,设置了CO2缓增处理(EC:每年增加 40 μL·L-1, 至采样时CO2浓度为CK+160 μL·L-1)。采用稳定性同位素示踪、定量PCR和高通量测序等手段,分析了不同CO2处理下水稻关键生育期(分蘖期、拔节期和开花期)稻田n-damo活性及其功能微生物Candidatus Methylomirabilis oxyfera (M. oxyfera)-like细菌的丰度、多样性和群落组成。结果发现,EC处理在一定程度上刺激了土壤中n-damo活性以及M. oxyfera-like细菌丰度,且在拔节期达到了显著性水平。EC处理还使M. oxyfera-like细菌的群落组成发生了显著改变,并影响了其多样性。EC处理下土壤可溶性有机碳含量和无机氮含量的改变很可能是导致n-damo活性及M. oxyfera-like细菌群落结构发生变化的重要原因。综上,稻田n-damo过程对大气CO2浓度缓增具有正响应,表明了其在未来气候变化背景下对稻田甲烷减排的积极作用。

    Abstract:

    Nitrite-dependent anaerobic methane oxidation (n-damo) is a novel pathway for controlling methane emissions from paddy ecosystems. However, the contribution of n-damo to methane oxidation and its response to elevated atmospheric CO2 concentration are poorly known. Here, an ambient CO2 treatment (CK) and a slow increase of atmospheric CO2 treatment (EC: an increase of 40 μL·L-1 per year above CK until 160 μL·L-1) were set up based on the CO2 automatic control platform with open top chambers. The stable isotope tracer experiment, quantitative PCR and high-throughput sequencing were employed to investigate the n-damo activity, abundance, diversity and community composition of Candidatus Methylomirabilis oxyfera (M. oxyfera)-like bacteria in paddy soils across key rice growth stages (tillering, jointing and flowering stages) under different CO2 treatments. The results showed that EC treatment stimulated the n-damo activity and abundance of M. oxyfera-like bacteria, particularly at the jointing stage. Further, EC treatment significantly changed the community composition and diversity of M. oxyfera-like bacteria. The variations in soil dissolved organic carbon content and inorganic nitrogen content under EC treatment could probably cause the change of n-damo activity and the community structure of M. oxyfera-like bacteria. Taken together, our results showed a positive response of n-damo to the slow increase of atmospheric CO2 concentration, suggesting its active role in reducing methane emissions from paddy fields under the future climate conditions.

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金靖昊,黄翯宸,沈李东,田茂辉,刘心,杨王挺,杨钰铃,刘佳琦,任冰洁,徐江兵,胡正华.稻田亚硝酸盐型甲烷厌氧氧化对大气CO2浓度缓增的响应[J].土壤学报,DOI:10.11766/trxb202111250641,[待发表]
Jin Jinghao, Huang Hechen, Shen Lidong, Tian Maohui, Liu Xin, Yang Wangting, Yang Yuling, Liu Jiaqi, Ren Bingjie, Xu JiangBing, Hu Zhenghua. Response of nitrite-dependent anaerobic methane oxidation in paddy fields to slow increase of atmospheric CO2 concentration[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202111250641,[In Press]

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  • 收稿日期:2021-11-25
  • 最后修改日期:2022-02-28
  • 录用日期:2022-06-02
  • 在线发布日期: 2022-07-12
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